Name the new file's author, and require the group depth

The file this branch adds takes the contributor's name rather than
AlphaSierraPapa, and three comments it added drop their en-GB spelling.

EndOpenGroups now requires its target depth: zero is the one value that closes
groups the caller does not own, which is the misattribution the depth argument
was added to prevent.

Assisted-by: Claude:claude-opus-5[1m]:Claude Code

ICSharpCode.Decompiler/DebugSteps/Stepper.cs

@@ -271,10 +271,11 @@ namespace ICSharpCode.Decompiler.DebugSteps
 		/// The groups are kept even when empty: a group that recorded nothing before it was abandoned is
 		/// precisely the one worth seeing, and <see cref="EndGroup"/>'s removal path expects the group to
 		/// still be the last entry of its parent, which an unwind cannot guarantee.
-		/// Closing stops at <paramref name="targetDepth"/>: a group that was already open before the
+		/// Closing stops at <paramref name="targetDepth"/>, which every caller must state: a group that
+		/// was already open before the
 		/// unwinding code ran belongs to whoever opened it, not to the unwind.
 		/// </summary>
-		public void EndOpenGroups(int targetDepth = 0)
+		public void EndOpenGroups(int targetDepth)
 		{
 			while (groups.Count > targetDepth)
 				EndGroup(keepIfEmpty: true);

ILSpy.Tests/Views/DebugStepsTests.cs

@@ -95,7 +95,7 @@ public class DebugStepsTests
 		// from the View into the VM. If `Steps` is populated, any view that binds to it (now
 		// or later) will render the correct content.
 		//
-		// Recording is what produces steps at all, and no view is realised to switch it on here.
+		// Recording is what produces steps at all, and no view is realized to switch it on here.
 		AppComposition.Current.GetExport<DebugStepsPaneModel>().SetRecordingEnabled(true);
 
 		var window = AppComposition.Current.GetExport<MainWindow>();
@@ -128,7 +128,7 @@ public class DebugStepsTests
 	[AvaloniaTest]
 	public async Task CSharp_DebugSteps_Are_Grouped_By_Ast_Transform()
 	{
-		// Steps exist only while the pane asks for them, and nothing realises the pane's view here,
+		// Steps exist only while the pane asks for them, and nothing realizes the pane's view here,
 		// so this test asks the same way the view does.
 		AppComposition.Current.GetExport<DebugStepsPaneModel>().SetRecordingEnabled(true);
 
@@ -347,7 +347,7 @@ public class DebugStepsTests
 	[AvaloniaTest]
 	public async Task CSharp_DebugSteps_Cover_IL_Transforms_And_Replay_Renders_ILAst()
 	{
-		// Recording the IL half is what an open pane switches on; nothing realises the pane's view
+		// Recording the IL half is what an open pane switches on; nothing realizes the pane's view
 		// here, so this test asks for it the same way the view does.
 		var debugStepsVm = AppComposition.Current.GetExport<DebugStepsPaneModel>();
 		debugStepsVm.SetRecordingEnabled(true);

ILSpy/Languages/TypedILLanguage.cs

@@ -1,4 +1,4 @@
-// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
+// Copyright (c) 2026 Siegfried Pammer
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy of this
 // software and associated documentation files (the "Software"), to deal in the Software